V4/nsys/conf.h

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struct
{
	char	d_minor;
	char	d_major;
};

struct
{
	int	(*d_open)();
	int	(*d_close)();
	int	(*d_strategy)();
} bdevsw[];

struct
{
	int	(*d_open)();
	int	(*d_close)();
	int	(*d_read)();
	int	(*d_write)();
	int	(*d_sgtty)();
} cdevsw[];